google-nomulus/java/google/registry/monitoring/metrics/MetricsUtils.java

// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package google.registry.monitoring.metrics;

import static com.google.common.base.Preconditions.checkArgument;

import com.google.common.collect.ImmutableList;

/** Static helper methods for the Metrics library. */
final class MetricsUtils {

  private static final String LABEL_SIZE_ERROR =
      "The count of labelValues must be equal to the underlying Metric's count of labels.";

  private MetricsUtils() {}

  /**
   * Check that the given {@code labelValues} match in count with the count of {@link
   * LabelDescriptor} instances on the given {@code metric}
   *
   * @throws IllegalArgumentException if there is a count mismatch.
   */
  static void checkLabelValuesLength(Metric<?> metric, String[] labelValues) {
    checkArgument(labelValues.length == metric.getMetricSchema().labels().size(), LABEL_SIZE_ERROR);
  }

  /**
   * Check that the given {@code labelValues} match in count with the count of {@link
   * LabelDescriptor} instances on the given {@code metric}
   *
   * @throws IllegalArgumentException if there is a count mismatch.
   */
  static void checkLabelValuesLength(Metric<?> metric, ImmutableList<String> labelValues) {
    checkArgument(labelValues.size() == metric.getMetricSchema().labels().size(), LABEL_SIZE_ERROR);
  }
}